|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||62/625 ; 62/630 ; 62/927 ; 62/929|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 64 인용 특허 : 1|
A process for concentrating and recovering methane and carbon dioxide from landfill gas includes absorption of commonly occurring pollutants using a reduced amount of carbon dioxide absorbent which itself may be an in situ derived and recoverable constituent. Separated methane may be concentrated into a high heating value fuel, and a highly pure food-grade carbon dioxide product may also be recovered. Process streams may be used to provide fuel for compression and refrigeration and/or to regenerate carbon dioxide absorbent.
[ What is claimed is:] [1.] A gas separation process for separating carbon dioxide, methane and trace contaminants contained in a landfill gas feed stream comprising the steps of:separating said trace contaminants from said landfill gas feed stream to form a methane product gas stream containing substantially only carbon dioxide, methane and nitrogen,introducing said methane product gas stream into an absorption column for contact with a solvent to form a second methane product containing substantially only methane and nitrogen and a carbon-dioxide enric...